3D Interconnected MoS₂ with Enlarged Interlayer Spacing Grown on Carbon Nanofibers as a Flexible Anode Toward...

Molybdenum disulfide (MoS₂) has attracted extensive research interest as a fascinating anode for sodium-ion batteries (SIBs) because of its high specific capacity of 670 mA h g^-1. However, unsatisfied cycling durability and poor rate performance are two barriers that hinder MoS₂ for practical application in SIBs. Herein, 3D interconnected MoS₂ with enlarged interlayer spacing epitaxially grown on 1D electrospinning carbon nanofibers (denoted as MoS₂@CNFs) was prepared as a flexible anode for SIBs via l-cysteine-assisted hydrothermal method. Benefitting from the C-O-Mo bonding between the CNFs and MoS₂ as well as the rational design with novel structure, including the well-retained 3D interconnected and conductive MoS₂@CNFs networks and expanded (002) plane interlayer space, the flexible MoS₂@CNFs electrode achieves a remarkable specific capacity (528 mA h g^-1 at 100 mA g^-1), superior rate performance (412 mA h g^-1 at 1 A g^-1), and ultralong cycle life (over 600 cycles at 1 A g^-1 with excellent Coulombic efficiencies exceeding 99%). The elaborate strategy developed in this work opens a new avenue to prepare highly improved energy storage materials, especially suitable for flexible electronics.